Claims
- 1. A filamentary product consisting of in cross section:
- a core of amorphous carbon;
- an integral skin layer of highly-oriented graphite having boron, dispersed therein, said graphite being formed by the catalytic conversion of the surface region of the amorphous carbon filament; and
- an outer layer of boron deposited on the integral skin layer.
- 2. A filamentary product as defined in claim 1 wherein said graphite skin layer is less than 0.2 mil thick.
- 3. A filamentary product as defined in claim 1 wherein said graphite skin layer is in the range of 0.02-0.05 mil thick.
- 4. A filamentary substrate to receive a pyrolytically deposited coating of boron consisting of in cross section:
- a core of amorphous carbon; and
- an integral skin layer of highly-oriented graphite having boron dispersed therein, said graphite being formed by the catalytic conversion of the surface region of the amorphous carbon filament.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a divisional of Serial Number 634,478, filed Nov. 24, 1975, now U.S. Pat. No. 4045597 which in turn is a C-i-p of Serial Number 230,867 filed Mar. 1, 1972, now abandoned.
US Referenced Citations (11)
Divisions (1)
|
Number |
Date |
Country |
Parent |
634478 |
Nov 1975 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
230867 |
Mar 1972 |
|